How to Solve Microsoft Security Essentials Installation Errors

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When installing the free antivirus program by Microsoft for Windows XP, Vista and Windows 7, you may receive Microsoft Security Essentials installation errors, the installation will not continue or the error code is 0x80070643. Follow the steps below to succeed to installing the antivirus software.

How to solve Microsoft Security Essentials Installation Errors?

How to solve Microsoft Security Essentials Installation Errors?

To possibly solve the failed installation of Microsoft Security Essentials, use the steps below in the order shown.

Step 1: Remove any existing antivirus program by other vendors

If your already removed antivirus is not listed, check the vendors’ website or simply use AppRemover.

  • Reboot the PC and try installing Microsoft Security Essentials again.

Step 2: Verify the status of Windows Installer service

  • Open the Services console in Windows by typing services.msc in Run/Search box.
  • Locate Windows Installer service. Double-click the service to bring up the properties. If the status is “Stopped”, click the “Start” button. Click OK to apply the command then close the Services console. Try to install Microsoft Essentials.
  • If the status of Windows service is “Started”, close the Services console.
  • Type cmd in Run/Search box then press enter to open the Command Prompt. In Vista and Windows 7, right-click cmd in the list of programs that the Search utility will display then select “Run as admin” to continue using Command Prompt.
  • In Command Prompt window, type this command msiexec /regserver then press enter in the keyboard. Note that there is no confirmation to see if the command failed or succeeded. Simply close the Command Prompt window after pressing the enter key.
  • Try installing Microsoft Security Essentials again.

Note: If you are using Windows XP, verify that you have Windows Installer v3.1 or higher version. If you have a version of Windows Installer lower than v3.1, proceed to download the new version for your operating system by downloading it from the Microsoft website.

Others Steps to Solve Installation Errors of Microsoft Security Essentials

Step 3: Start Windows in Selective Startup mode

  • Type msconfig in Run/Search box in Windows then press enter.
  • In General tab, click Selective Startup and then clear the Load Startup Items check box.
  • In the Services tab, select the Hide All Microsoft Services check box, and then clear all the check boxes for the services that remain in the list.
  • Click OK to apply the selection. Restart the PC and try installing Microsoft Security Essentials.

Step 4: Review the Installation Log of Microsoft Security Essentials

  • Locate msseInstall.log in Windows XP - C:\Documents and Settings\All Users\Application Data\Microsoft\Microsoft Security Essentials\Support or in Vista and Windows 7 – C: \ProgramData\Microsoft\Microsoft Security Essentials\Support
  • Open the log file and use the find tool to search for “return value 3”. If the log has the following items, proceed to the step below:

MSI (s) (CC:2C) [13:27:24:987]: Hello, I’m your 32bit Elevated custom action server.

MSI (s) (CC:E0) [13:27:25:283]: User policy value ‘DisableRollback’ is 0

MSI (s) (CC:E0) [13:27:25:283]: Machine policy value ‘DisableRollback’ is 0

Action ended 13:27:25: InstallFinalize. Return value 3.

  • Click Start then click Run/Search. Type this command: CACLS “c:\documents and settings\all users\desktop” /t /g everyone:f to give everyone permission to the desktop.
  • Next, type the following to give everyone a permission to the Programs Menu:

For Vista and Windows 7, type: CACLS “C:\ProgramData\Microsoft\Windows\Start Menu\Programs” /t /g everyone:f

For XP, type: CACLS “C:\Documents and Settings\All Users\Start Menu\Programs” /t /g everyone:f

  • Reboot the computer and try installing Microsoft Security Essentials again.

If none of the above steps help in solving the installation of Microsoft Security Essentials, proceed to submitting an online support case to Microsoft. If you are in the U.S. or Canada, you may also call Microsoft at 1-866-727-2338 for support. A support forum for Microsoft Security Essentials is also available, in case you want to see if other people have shared any work-arounds to solve the installation process of the antivirus program by Microsoft.

For end-users who only want to fix Microsoft Security Essentials by resetting its settings, try using Fix MSE Utility by The Windows Vista Club.